I'm searching for "no random battle" cheat code.
I tried the code for the U version but it don't work.
You can help me?

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The best way to achieve what you want is to download whatever cheats you need for your flash cart from here. Then use the "Unlock all abilities" cheat, when you start your game there is an ability called "Safe Travel" which turns off random battles, assign that to whatever character you want and there you go.